I think you could use it, i certainly would but sparingly just for the occasional show and holiday in it. As long as mileage stays less than 10k i don't think it would harm value at all.

Through the Audi A2 contacts i went round a guys house coupe evenings ago for wheels, you should have seen the E30 318is he had tucked away, stunning.
Genuine 1 lady owner only 49k and mint inside and out with that lovely light grey tartan interior and he only paid peanuts for it. It's the only Bm i would like to own.